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===The Horus Heresy===

{{main|Horus Heresy}}

This turn of events did not please all of the Emperor's subjects, several of his sons in particular. In the final stages of the [[Great Crusade]], the Emperor's most trusted son [[Horus]] succumbed to Chaos temptation. Horus was told that the reason the Emperor had left the Great Crusade was so he could attempt to reach godhood, abandon all his sons and betray one of the central tenets of the Great Crusade (to enlighten humanity and free it from the bonds of false gods). Horus saw it as his duty to save the Imperium and turned on his father. Having corrupted fully half of the [[Space Marine Legion]]s, Horus led them against the Emperor and plunged the fledgling galactic empire into a colossal civil war. This became the most terrible conflict in human history, and billions perished as the Traitor Legions tore apart the empire they had helped to forge.{{Fn|5}} The Emperor's son [[Magnus]] attempted to warn his father of the coming slaughter, but his telepathic message breached the Emperor's psychic wardings at the Imperial Palace and caused a grievous malfunction in the Golden Throne. Distraught, the Emperor ignored Magnus' warning and banished his son from his sight. The Emperor then dispatched the [[Space Wolves]] under [[Leman Russ (Primarch)|Leman Russ]] to [[Burning of Prospero|bring back]] Magnus before him in chains. However the now-corrupted Horus intercepted the Emperor's order and changed it, instead ordering the Thousand Sons destroyed.{{Fn|15}}

[[Image:EmperorBD.jpg|thumb|right|250px|The Emperor appears before the [[Knights-Errant]], revealing to them their [[Grey Knights|new mission]]{{Fn|20}}]]

*The [[Emperor's Bolter]]{{Fn|14f}}

*The [[Emperor's Shield (Relic)|Emperor's Shield]]

*The [[Dionysian Spear]] (gifted to [[Leman Russ (Primarch)|Leman Russ]])

*{{Endn|9}}: [[The First Heretic (Novel)]], {{Cite This}}, pg. 292

*{{Endn|10}}: [[Inquisitor: The Thorians]], pg. 4

*{{Endn|12}}: [[Deliverance Lost (Novel)]], {{Cite This}}

*{{Endn|13}}: [[The Outcast Dead (Novel)]], {{Cite This}}

**{{Endn|14a}}: Epilogue

**{{Endn|14b}}: Chapter 13

**{{Endn|14g}}: Chapter 7

*{{Endn|15}}: [[War Zone Fenris: Wrath of Magnus]] — ''Echoes in Time''

*{{Endn|17}}: [[The Wolf of Ash and Fire (Short Story)]]

*{{Endn|19}}: [[Malcador: First Lord of the Imperium (Audio Drama)]]

*{{Endn|20}}: [[The Buried Dagger (Novel)]] - Chapter 7

*{{Endn|22}}: [[The Solar War (Novel)]] - Prologue & Epilogue

**{{Endn|23a}}: Chapter 30

**{{Endn|23b}}: Chapter 4

*{{Endn|27}}: [[The Board is Set (Short Story)]]

*{{Endn|28}}: [[Konrad Curze: The Night Haunter (Novel)]], Chapter 13

**{{Endn|29a}}: Chapter 17

**{{Endn|29b}}: Chapter 8

*{{Endn|30}}: [[Saturnine (Novel)]], Part 2 Chapter 3

*{{Endn|31}}: [[Horus Rising (Novel)]], Part Three, Chapter One

**{{Endn|37b}}: Chapter 38

**{{Endn|37c}}: Chapters 40-43

**{{Endn|38a}}: 1:iv

**{{Endn|38b}}: 1:xxi

**{{Endn|38f}}: 1:iii

**{{Endn|38g}}: 1:v

*{{Endn|39}}: [[White Dwarf 117 (UK)]], pgs. 13-14

*{{Endn|40}}: [[ Index Astartes IV]], pgs. 114-116 — Promethean Warriors: The Salamanders Space Marine Chapter

*{{Endn|46}}: [[Realm of Chaos: The Lost and the Damned]], pg. 175

*{{Endn|47}}: [[Horus Rising (Novel)]] - Part 2, Ch. 6

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{{Deities}}